Dust cap for tire valves



Dec.- 18,1928 1,695,818- E. G. OAKLEY DUsT CAP FOR TIRE YALYES Filed July 9, 1924 Patented Dec. 1 8, 1928.

"MEAN-Y OF "BR/IMPORT, GONNEQTIGUT;

- nu-s21. CAI FOB TIM-Vanna This invention feglat es to {111st ca s gfpx" sofcalled fire valves or ,the hke, more valve s em r sh l n gen r l use i m n n with pn umztt iires- Amending to t p s n i ent Qn, 1 p Vide a dust cap which may be termed; fslgp o'n? cap inthat it may he sggufi d in ,Place ,by a longitudinal thrust; and withq p the newssity bf a rntatiye moyement rlatlyl y toftghe st m. It mayb removed in thefsam e manngr and t h refdr'e ,m'ay "bep a ed. 1 91 and 17e-v mpve mm, he tem with i iac ll y 1 1 w ;e-- lerjit when des'i'reid. At the same, ti'me,mean mi rovided \fQ .s i r y holding h c p in pla e so that there Willbe pod iilger 9f i ts ac'id nti em m from $11 m, mid Lt e 1,11- g es oidu and iqlz ign m tte bou t e same w'illl bekoby iat ed.

Qn object of nwfin n i m p id a dust v 1p :i r in Yalyeistm' h h may si y e lmm ficed f qm and t p'lac upon the s'tem a nl which, at the sgmegtfimg, will be Qn m c-a -to .ma 1' ia 'm r and w l b -S ViSiOIl off a lip on dust cap which maybe readily applied to the tire ivaly e stemfinl which w b iric iQna yfinld it g t yf ld h reonrso tha will no be 10 il l 91 v of 7 parts to valve stem, havingqther eon 1a dnst cap embod yingmy impr byements i an enl g d sectmna y ew 1 11 du s tj ca p and rim ,nut on line 3-1- 3, of Fig; 1,:

Fig 4 h :a ,sectional View on li f )1 and Y F- igniis an enl-a fged sectional gviewsimilai,

to Fig, 2, but h wingfth y zst m wit i thendu st cap, and the latter seated in therecegs in therim nut. v

Befeagring to Fig. 1 ofjthq dfawi lgs-Ighgwe shown a Wheel felLy gg-t l O to which is ;sec11red the rim 11, the-rim andwfelly beingfpgv fomted fonthe. passggeofithe usual:threadgd va v st mlf e zmf d tp h inne -tube 1 in,

i s nti e body xep hi itis u ual y .b g' erein lfte desc b d nd "Eigi id le h t na xie f Fa 're mniol they v l tfi awh c mayb eg ll e in size is zogdi mri ly placqd a valvge cap 15 ltih n plwd ver th Ip i tin -fin :Q th valve emand!alsofovs 'k rv v mp,wh qh I is ,Qf s u fiici enfl y small size 1:0 be filfleely r ee ve Within the d t mp I \Ac o'rd n t th presen in fi mn, 1% mm ut- .l hprwid d i h a (th ad 1 0 2 8, i hne d MPG-I1 :t e {valve ste and arzrw ed Qz eatagainh w l f lly E s fimmu't may be provided with agbqtjqolh -qavity 1 9 ece v ash r, 0. the lik 0, h9W1 w h i stomarily dispo e i stwfi n fi wer, a fhe mum eth f lly- .1 Th im nu is p d d:,-, xi Mappe a ith casz yzon ea fili rthe imrrmiown anula rdflp s wimmi g th r-n zi j tem- 4A cle yslww in igsaianigr the diam tar 41 s avi y is ,spm wha v111 qr ha that 1f .ihe h d d :h re 11 fi ifi PATE T;QF1c;.;

ERASZDUSIG. oA mmgor so nmnroncr, OWNEGTICUZT,A:SSIGNOBTO ammnrcnw amass wil arem ini s waq t he gpa iphfl y f ifihis wly ndgthe Qext Q -su fiu E-Q 1 Mal-W tem-n Aba n t ppernedgq, e W311 0 wil fi ea it erf f. he 1 m zwh ipl efl or place git upon the stem.

Adiawn ts 1: ower end h m tal 59f he all qf the dusjt oapis displaqed inwardly at aced p nt around th ir u e e o he ap :t ipwv-ide, inumbg 50f dep sed I inafter.

offset from the inner wall of the cap to a portions or ribs 25. Four of these depressed width.' The ribs will ordinarily possess no resilience relatively to the body of the cap itself, so that any pressure upon these ribs will tend to distort the whole cap rather, than to distort the ribs, as will be explained here- The inner surface of these ribs is sufficient extent to contact with the exterior threaded surface of the stem and secure the cap in place. It will be understood, of course,-that the cap may be freely slipped on and off the valve stem and that no rotary or turning movement is required to secure it in place. The outer diameter of the cap 16 is preferably substantially equal to the inner diameter of the cavity 21 so that the cap will seat snugly therein, as shown in Fig. 5.

When the cap is applied to the valve stem at least some of the depressed ribs 25 will lie opposite the threaded or convex portions of the stem, and as these ribs contact with the stem they will cause the cap to grip the latter and to be held thereon. The outward pressure exerted by the stem upon these rib portions will cause the cap to be distorted into a somewhat elliptical or oblong shape cross-section, the sides of the cap opposite the flat sides of the stem being permitted to be drawn together slightly asat these points the ribbed portions are not in contact with the sides of the stem as-shown in Fig. 4. The

tendency of the cap, the metal of which is somewhat resilient, to restore itself to its normal shape, will bring abouta tight gripping action between the cap and stem.

When, however, the cap is moved downwardly upon the stem to a sufiicient extent,

the lower end enters the cavity 21, which is] circular in shape and substantially of the same diameter as the exterior diameter of thecap. The flaring mouth 22 of the cavity 21 properly receives thelower end of the cap and guides it into place, notwithstanding the fact that this end of the cap will be somewhat elliptical in shape, as otherwi'sethe distorted end of the cap might offer resistanceto such movement. It will now be apparent that two opposing forces are acting upon the wall of the cap at adjacent points, in that the wall of the cavity 21 tends to force the wall of the cap into a truly circular shape while at a point above the upperedge-of the nut 17, and especially opposite the ribs 25 the pressure of the stem upon these ribs'tends to deform the cap into the oblong or elliptical shape referred to above. The result is that the normal tendency of the cap to restore itselfto its circular shape and the consequent pressure of. the ribs upon the valve stem will be augmented by the pressure of the wall of the'cavity 21- upon thecap, and a still tighter gripping action will be produced. In other words, two opposing forces will be reacting upon the cap, one of which tends to distort it into an oblong shape and the other tendingto force it in'toits normal'circular shape, f the result being that there will be a grippingaction not only between the valve stem and dust cap, but also between the dust cap and rim nut, so thatthe former will be securely held in place.

At the same time, the cap may be applied" to and removed from the stem by a longitudinal thrust without the necessity of any rotary movement; It is, of course, not neces sary tolocate the ribs 2e so that some of these may lie opposite the flat sides of the valve stem, as shown at Figs. 8 and 4, for all of the ribs may lie opposite and engage the convex part of the stem, if it so happens that the cap is applied in this/position, and the operation of the parts will not be affected as the depressed ribs Willffunction equally well in frictionally holding the cap in place.

While I have shown and described a preferred embodiment of my invention, it' will be understood that itis not to be limited to the'details shown but is capable of modifica tion and variation Within the spirit of the invention and within the scope of the appended claims.

WVhat I claim is: p 1 v 1; In combination, a valve stem, a resilient nietaldust cap adapted to be placed thereon, the wall of said dust cap being depressed in wardly to provide non-resilient ribs projecting beyond the inner wall of the cap, said ribs being adapted to engage the valve stem and to distort the cap from ltSIlOlll'lfll sha e and thereby cause it to grip the stem, an a rim nut provided with an upwardly facing recess to receive the lower edge of the valve cap and urge it to its normal shape.

2. In combination, a'valve stem, a'resilient metal dust cap adapted to be placed thereon, said dust cap being normally of circular shape and adapted to be slipped freely upon the valve stem, the wall of said'cap being displaced inwardly at spaced pointsadjacent its lower end to provide non-resilient ribs, said ribs being adapted to engage the stem and distort'the cap from its normal circular shape, when it is placed upon the stem, and a rim nut provided with an upwardlyfacing recess to receive the lower edge of the valve urge it to its normal shape. I

3. In combination, a valve stem, a resilient metal dust cap of circular cross-sectional shape adapted to be placed thereon, the wall cap and of said dust cap being depressed inwardly but not cut through to provide non-resilient ribs projecting beyond the inner wall of the cap at spaced points, said ribs being adapted to engage the valve stemandto distort the cap from its normal circular shape and thereby cause it to grip the stem, and means to receive the lower edge of the dust cap when placed upon the stem and urge it to its normal circular shape.

4. In combination, a valve stem, a resilient metal dust cap of circular cross-sectional shape adapted to be placed thereon, the wall of said dust cap being depressed inwardly but not cut through to provide non-resilient ribs projecting beyond the inner wall of the cap at spaced points, said ribs beingadapted to engage the valve stem and to distort the cap from its normal circular shape and therebyrcause it to grip the stem, and means mounted upon said stem and provided with an upwardly facing flaring cavity within which the lower edge of the dust cap is received and urged to its normal circular shape.

5. A dust cap comprising a hollow elon-V gated body closed at one end and open at the other and provided with a relatively thin resilient wall, the wall of the cap adjacent the open end thereof being displaced inwardly, but not cut through, at spaced points to provide narrow elongated ribs integrally connected upon allsides with the cap, the ribs being adapted to engage an object over which the cap is placed and distort the open end of the cap from its normal shape to secure the latter in position. 7

In Witness whereof, I have hereunto set my hand this 7 day of July, 1924.

ERASTUS G. OAKLEY. 

